DATASHEET
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3
9DB433
IDT®
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3 1
9DB433 REV H 06/07/16
General Description
The 9DB433 zero-delay buffer supports PCIe Gen3
requirements, while being backwards compatible to PCIe
Gen2 and Gen1. The 9DB433 is driven by a differential
SRC output pair from an IDT 932S421 or 932SQ420 or
equivalent main clock generator.
Recommended Application
4 output PCIe Gen1,2,3 zero-delay/fanout buffer
Key Specifications
Output cycle-cycle jitter <50ps
Output to Output skew <50ps
Phase jitter: PCIe Gen3 <1.0ps rms
Features/Benefits
3 Selectable SMBus Addresses; multiple devices can
share the same SMBus Segment
OE# pins; Suitable for Express Card applications
PLL or bypass mode; PLL can dejitter incoming clock
Selectable PLL bandwidth; minimizes jitter peaking in
downstream PLL's
Spread Spectrum Compatible; tracks spreading input
clock for low EMI
SMBus Interface; unused outputs can be disabled
Supports undriven differential outputs in Power Down
mode for power management
Output Features
4 - 0.7V current-mode differential HCSL output pairs
Supports zero delay buffer mode and fanout mode
Selectable bandwidth
50-110 MHz operation in PLL mode
5-166 MHz operation in Bypass mode
Functional Block Diagram
STOP
LOGIC
SRC_IN
SRC_IN#
DIF(6,5,2,1)
CONTROL
LOGIC
BYP#_LOBW_HIBW
SMBDAT
SMBCLK
PD#
SPREAD
COMPATIBLE
PLL
4
IREF
M
U
X
OE(6,1)#
2
9DB433
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3
IDT®
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3 2
9DB433 REV H 06/07/16
Pin Configuration
SMBus Address Selection and Readback
PLL Operating Mode Readback Table
Power Groups Tri-Level Input Logic Pins
VDDR 1 28 VDDA
SRC_IN 2 27 GNDA
SRC_IN# 3 26 IREF
GND 4 25 PD#
VDD 5 24 VDD
DIF_1 6 23 DIF_6
DIF_1# 7 22 DIF_6#
OE1# 8 21 OE6#
DIF_2 9 20 DIF_5
DIF_2# 10 19 DIF_5#
VDD 11 18 VDD
BYP#_HIBW_LOBW 12 17 SMB_ADR_tri
SMBCLK 13 16 VDD
SMBDAT 14 15 GND
Notes:
9DB433
Highlighted Pins are the differences between 9DB403 and
9DB433.
Pin 12 and Pin 17 are latched on power up. Please make sure
that the power supply to the pullup/pulldown resistors ramps at
the same time as the main supply to the chip.
SMB_ADR_tri Address
Low DA/DB
Mid DC/DD
High D8/D9
BYP#_LOBW_HIBW MODE Byte0, bit 3 Byte 0 bit 1
Low Bypass 0 0
Mid PLL 100M Hi BW 1 0
High PLL 100M Low BW 0 1
VDD GND
1 4 SRC_IN/SRC_IN#
5,11,18, 24 4 DIF(1,2,5,6)
16 15 DIGITAL VDD/GND
28 27 Analog VDD/GND for PLL in IREF
For best results, treat pin 1 as analog VDD.
Description
Pin Number
State of Pin Voltage
Low <0.8V
Mid 1.2<Vin<1.8V
High Vin > 2.0V
9DB433
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3
IDT®
FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1,2,3 3
9DB433 REV H 06/07/16
Pin Descriptions
PIN # PIN NAME PIN TYPE DESCRIPTION
1 VDDR PWR
3.3V power for differential input clock (receiver). This VDD should be treated as an
analog power rail and filtered appropriately.
2 SRC_IN IN 0.7 V Differential SRC TRUE input
3 SRC_IN# IN 0.7 V Differential SRC COMPLEMENTARY input
4 GND PWR Ground pin.
5 VDD PWR Power supply, nominal 3.3V
6 DIF_1 OUT 0.7V differential true clock output
7 DIF_1# OUT 0.7V differential Complementary clock output
8OE1# IN
Active low input for enabling DIF pair 1.
1 =disable outputs, 0 = enable outputs
9 DIF_2 OUT 0.7V differential true clock output
10 DIF_2# OUT 0.7V differential Complementary clock output
11 VDD PWR Power supply, nominal 3.3V
12 BYP#_HIBW_LOBW IN Tri-level input to select bypass mode, Hi BW PLL, or Lo BW PLL mode
13 SMBCLK IN Clock pin of SMBUS circuitry, 5V tolerant
14 SMBDAT I/O Data pin of SMBUS circuitry, 5V tolerant
15 GND PWR Ground pin.
16 VDD PWR Power supply, nominal 3.3V
17 SMB_ADR_tri IN
SMBus address select bit. This is a tri-level input that decodes 1 of 3 SMBus
Addresses.
18 VDD PWR Power supply, nominal 3.3V
19 DIF_5# OUT 0.7V differential Complementary clock output
20 DIF_5 OUT 0.7V differential true clock output
21 OE6# IN
Active low input for enabling DIF pair 6.
1 =disable outputs, 0 = enable outputs
22 DIF_6# OUT 0.7V differential Complementary clock output
23 DIF_6 OUT 0.7V differential true clock output
24 VDD PWR Power supply, nominal 3.3V
25 PD# IN
Asynchronous active low input pin used to power down the device. The internal
clocks are disabled and the VCO and the crystal osc. (if any) are stopped.
26 IREF OUT
This pin establishes the reference for the differential current-mode output pairs. It
requires a fixed precision resistor to ground. 475ohm is the standard value for
100ohm differential impedance. Other impedances require different values. See data
sheet.
27 GNDA PWR Ground pin for the PLL core.
28 VDDA PWR 3.3V power for the PLL core.

9DB433AGLF

Mfr. #:
Manufacturer:
IDT
Description:
Clock Buffer 4 OUTPUT PCIE GEN3 BUFFER
Lifecycle:
New from this manufacturer.
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